@Chase110when exactly you listed your property? Bc this is what I found:
The discount expires for each enrolled listing after the third promotional booking, or 30 days after your promotion opt-in date, whichever happens first.
So if 30 days period ended on Saturday it would explain why Saturday is discounted and Sunday and Monday are not.
Here you can find the way how you can opt-out of it https://www.airbnb.com/d/promotions-you-can-apply